package cn.tedu.v6;

import java.io.*;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.util.*;


/**
 * Version  6     在线用户列表，统计上线名称
 *                消息转发---交互---服务器客户端文字
 */


public class Server {
    private static final Integer PORT = 1357;
    private ServerSocket serverSocket;
    private String ip;
    private List<PrintWriter> allOut=new ArrayList<>();
    //1.存储在线客户：onlineUsers
    private List<String> onlineUsers=new ArrayList<>();
    private Map<String,String> userDatabase;
    public Server() {
        try {
            serverSocket = new ServerSocket(PORT);
            userDatabase=new HashMap<>();
            userDatabase.put("姜哲","123456");
            userDatabase.put("哲哲","654321");
        } catch (BindException e) {
            System.out.println("请检查端口号，被占用");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void start() {
        try {
            while (true) {
                System.out.println("等待客户端链接");
                Socket socket = serverSocket.accept();
                new Thread(new ClientHandler(socket)).start();
            }
        } catch (IOException e) {
            System.out.println("客户端链接失败了");
        } finally {
            if (serverSocket != null && !serverSocket.isClosed()) {
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    System.out.println("服务器关闭失败~~~");
                }
                System.out.println("服务器关闭成功~~Over");
            }
        }
    }

    public static void main(String[] args) {
        new Server().start();
    }

    private boolean Login(String user,String pass){
        return userDatabase.containsKey(user)&&userDatabase.get(user).equals(pass);
    }
    private class ClientHandler implements Runnable {
        private Socket socket;
        private String ip;
        private PrintWriter pw;
        private BufferedReader br;
        private String username;
        private String password;

        public ClientHandler(Socket s) {
            this.socket = s;
            ip = socket.getInetAddress().getHostAddress();
            System.out.println("客户端：" + ip + "连接上了");
            try {
                br = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF8"));
                pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF8")), true);
                synchronized (allOut) {
                    allOut.add(pw);
                }
            } catch (IOException e) {
                System.out.println("客户端断开链接了~");
            }
        }

        private synchronized void broadcastMessage(String message){
        for(PrintWriter pw:allOut){
          pw.println("消息广播"+message);
        }
    }
    //2.广播在线用户列表方法   updateOnlineUsers   更新在线人数
    //提醒：没有参数、传入字符串保存所有的客户端名称
    private synchronized void updateOnlineUsers(){
        synchronized (onlineUsers){
            String userList="在线用户："+String.join("、",onlineUsers);
            broadcastMessage("用户名消息"+userList);
        }
    }
    //2.1 String userList="在线用户：”+String.join("、"，onlineUsers);
    //理解：拼接字符串，来客户名，记录一个客户端名
    //2.2  来一个客户端，分发一个客户端消息：用户名消息
        private void handlerChat(){
            new Thread(() -> {
                try {
                    String message;
                    while ((message = br.readLine()) != null) {
                        System.out.println(ip + "服务器端说：" + message);
                        System.out.println("服务器端请输入：");
                        broadcastMessage(message);
                        updateOnlineUsers();
                        System.out.println("服务器端请输入：");
                    }
                } catch (IOException e) {
                    System.out.println("客户端发来的消息断开了~");
                }
            }).start();
            Scanner input = new Scanner(System.in);
            while (true) {
                System.out.println("服务器请输入：");
                String sme = input.nextLine();
                pw.println("服务器说：" + sme);
                if(sme.equalsIgnoreCase("exit")){
                    System.exit(0);
                }
            }
        }
        public void run() {
            try {
                pw.println("请输入用户名：");
                username=br.readLine();
                pw.println("请输入密码：");
                password=br.readLine();
                if(Login(username,password)) {
                    pw.println("登陆成功，欢迎进入姜哲牌聊天室");
                   //3.判断客户端链接成功---加入集合中       3.1【同步块:监视对象--集合】
                    //3.2 客户端登陆成功--名字加入集合中     方法？
                    synchronized (onlineUsers){
                        onlineUsers.add(username);
                        System.out.println(username+"连接成功");
                       updateOnlineUsers();
                    }
                    handlerChat();
                }else{
                    pw.println("登陆失败，用户名或密码错误!");
                    socket.close();
                }
            } catch(IOException e){
                System.out.println("服务器端读写出问题！");
            }finally {
                //4.同步块--从集合中依次移除用户名
                synchronized (allOut){
                    allOut.remove(pw);
                }
                synchronized (onlineUsers){
                    onlineUsers.remove(pw);
                }
                if (pw != null)
                    pw.close();
                if (br != null)
                    try {
                        br.close();
                    } catch (IOException e) {
                        System.out.println("读入流断开链接~");
                    }
                if (pw != null)
                    pw.close();
                if (socket != null && !socket.isClosed()) {
                    System.out.println(ip + "客户端退出服务器链接~");
                    try {
                        socket.close();
                    } catch (IOException e) {
                        System.out.println(ip + "客户端退出连接异常~");
                    }
                }
            }
        }
    }
}
